Mesoporous MnO2 Nanosphere/Graphene Sheets as Electrodes for Supercapacitor Synthesized by a Simple and Inexpensive Reflux Reaction
Mesoporous MnO2 Nanosphere/Graphene Sheets as Electrodes for Supercapacitor Synthesized by a Simple and Inexpensive Reflux Reaction
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通过简单且廉价的回流反应合成介孔二氧化锰纳米球/石墨烯片作为超级电容器的电极
DOI：
10.1016/j.electacta.2017.02.153
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发表时间：
2017-06
影响因子：
6.6
通讯作者：
Limei Duan
中科院分区：
文献类型：
--
作者：
Limei Duan
具有大比容量、循环稳定性和高倍率性能的新型电极材料对推动超级电容器的发展具有重要意义。通过简单、廉价的回流反应合成了介孔MnO2纳米球固定的还原氧化石墨烯(MG)纳米复合材料。以草酸为还原剂，回流法制备了氧化石墨烯(GO)负载的介孔MnO2纳米球。当电流密度为1Ag1时，MG电极的比电容为466.7Fg1，是纯MnO2的3.33倍(140fg1)，是石墨烯的3.19倍(146fg1)。倍率能力达到10A G1，比电容为454.8F G1。在1AG1下循环2000次，容量保持率为92%。电化学阻抗谱(EIS)显示了介孔和RGO在促进电子传输和离子在孔和界面上扩散方面的作用
The new electrode materials with large specific capacitance, cycling stability and high rate capability are.important to advance the development of supercapacitors. A nanocomposite of mesoporous MnO2.nanospheres anchered reduced graphene oxide (MG) was synthesized by a simple and inexpensive reflux.reaction. KMnO4 refluxed with oxalic acid as reducing agent was used to the growth of mesoporous MnO2.nanospheres on graphene oxide (GO). The MG as an electrode exhibits a specific capacitance of.466.7 F g1 at a current density of 1 A g1, which is 3.33 times larger than that of pure MnO2 (140 F g1).and 3.19 times of graphene (146 F g1). The rate capability arrives at 10 A g1 with specific capacitance of.454.8 F g1. The capacitance retention is 92% over 2000 cycles at 1 A g1. The electrochemical impedance.spectroscopy (EIS) demonstrates roles of mesopores and RGO in facilitating electronic transport and ionic.diffusion across the pores and interfaces
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